Solar Blankets are made from a durable polymer material with thousands of tiny sealed air bubbles, designed to capture and transmit solar heat into your pool. Most heat loss in a pool is caused by evaporation. By trapping the heat, a Solar Blanket will reduce evaporation by approximately 95%, and will save up to 50% on pool chemical usage. Solar Blankets also act as a barrier to prevent leaves and debris from entering the pool, thereby reducing the time you need to spend on maintenance.